1988•Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology SocietyOpen access
Improved reliability of impedance cardiography by new signal processing techniques
Susheel Reddy, Liang-Yu Shyu, J.H. Nagel, Neil Schneiderman
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Abstract
The authors used the impedance cardiogram (ICG), the phonocardiogram (PCG), and the electrocardiogram (ECG) to determine stroke volume and systolic time intervals. Comparisons between a fully automated PC/AT-based signal processing system and a computer-assisted visual detection processing system revealed comparable means, standard errors, correlations (Spearman r), and reliability (Chronbach's alpha ) coefficients on all relevant parameters. Other analyses confirmed the utility of using Q onset to mark the beginning of ventricular systole, the B point of the ICG to denote the aortic opening, and end diastole as the reference for determining the amplitude of dZ/dt/sub mzx/.>